Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint and openWorldHint, so the safety profile is covered. The description usefully adds that the data is a 'current finite snapshot' (i.e., not a live feed) and discloses the limit clamping and page slicing behavior. Good extra context beyond annotations, though nothing on rate limits or freshness.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Two tight sentences, front-loaded with the core action and filter scope, followed by the routing hint. Zero waste.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a filtered search with an output schema and read-only annotations, the description covers purpose, filters, pagination, and alternatives. Adequate; nocache is admin-only and documented in the schema, and return values needn't be explained given the output schema.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the baseline is 3. The description restates the limit clamp (10–100) and page-slice behavior, which the schema already documents, and mentions the three filter params without adding syntax or format detail beyond the schema (e.g., ISO-2 codes). No meaningful value added over structured data.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb (search) and resource (Google News snapshot) with the scoping filters, and explicitly distinguishes itself from google_news (general feed) and the other news sources. An agent can tell what this does and how it differs from siblings without opening a schema.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

Names the alternatives (google_news, bing_news, brave_news) and the conditions that select them ('general feed', 'other news sources'). It clearly routes the agent, though it doesn't state when this tool is preferable to the plain alternatives other than by implication of the keyword/language/country filters.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.